As far as I can tell the US government, especially the current US President Obama, wants stricter laws concerning the ownership and / or acquisition of guns and weapons in the USA.
Now again as far as I can tell, there's the general idea in the US that whenever a (foreign) government reduces your potential sales, you can sue them to replace the money that you potentially may have gained. With the (foreign) only applying when there's a free-trade agreement (like TTIP or NAFTA) between the US and the foreign nation in question including investor-protection measures.
Now assume Obama convinces the congress to make a law to restrict the acquisition of guns (e.g., more controls for private sales, less people qualified to buy guns in the first place, etc.) or he just signs an Executive Order having the same effect.
In this scenario, can every single company that sells / produces guns sue the US government because their sales got reduced by this new law / executive order?